daxitude

This plugin adds an advanced code editor to the post content box on post.php and post-new.php. A third tab is added alongside Visual and HTML modes and you can toggle between the three.
NOTE: Visual Mode tends to eat up most/all of any special formatting. If you want to use ACE I’d suggest disabling Visual mode completely. You can do this easily yourself under Users -> Your Profile -> ‘Disable the visual editor when writing’. You can also do it for all users and for specific post types only. See the accompanying file no-visual.php for an example.
Not all features work in Internet Explorer v8 and earlier.
This does not work in full screen mode. Yet.
<h4>Features</h4>
<ul>
<li>Syntax highlighting</li>
<li>Tabbing</li>
<li>Line numbers</li>
<li>Auto closing of tags and quotes</li>
<li>Line highlighting</li>
<li>Default theme is TextMate</li>
<li>Fixed-width, soft wrap, adjustable height</li>
<li>Remembers your last used mode and loads it up on initial page view</li>
</ul>
<a href="http://ace.ajax.org/" rel="nofollow ugc">ACE Editor</a> can do quite a bit more. If you have integration ideas, let me hear about it
<h3>Todo</h3>
<ul>
<li>make height of editor consistent when toggling between modes</li>
<li>deal with auto_p? (might help preserve formatting from Visual mode)</li>
<li>make it work in full screen mode</li>
<li>allow users to set their ACE preferences on their profile screen</li>
</ul>

ACE Editor for WP

Adds ACE Editor to the post content editor for syntax-highlighting and more

treeflips

Yin Zhongzhen

Simple plugin that automatically copies content in <code><pre></code> and <code><code></code> tags to clipboard (when clicked). Other plugins out there do the same but create a little [COPY] button that you have to aim for. Mine doesn’t require any aiming, just click anywhere on the code block and it copies the whole thing. Customizable hover tooltip lets you know it’s copied.
For sites sharing code-commands, this plugin will save users time from having to highlight and copy-paste bits of text back and forth. It’s especially helpful for large globs of code that scroll off-screen, or when copying on your mobile phone. I’ve added more features to make it more helpful.
Features: 
* Easy aim – click anywhere on text block to copy entire text, no need to aim for tiny text or clipboard icon. 
* Tooltip text customization – change tooltip text. 
* Tooltip color options – customize tooltip background and text colors. 
* Tooltip hover custom CSS – completely restyle the tooltip hover. 
* Tooltip function custom CSS – apply tooltip function to other CSS classes. Allowing copy function on any content block, not only code blocks.

ACE Editor for WP vs Code Click to Copy